private static bool IsBeforeOrAfterNodeOnSameLine(
SourceText text,
SyntaxNode root,
SyntaxNode member,
int position
)
{
var token = root.FindToken(position);
if (
token == member.GetFirstToken() &&
position <= token.SpanStart &&
text.AreOnSameLine(position, token.SpanStart)
)
{
return(true);
}
if (
token == member.GetLastToken() &&
position >= token.Span.End &&
text.AreOnSameLine(position, token.Span.End)
)
{
return(true);
}
return(false);
}
internal (CodeAction action, TextSpan renameSpan) TryGetCodeAction(
Document document, SourceText text, TextSpan userSpan,
IEnumerable <IRefactorNotifyService> refactorNotifyServices,
ITextUndoHistoryRegistry undoHistoryRegistry,
CancellationToken cancellationToken)
{
try
{
// This can be called on a background thread. We are being asked whether a
// lightbulb should be shown for the given document, but we only know about the
// current state of the buffer. Compare the text to see if we should bail early.
// Even if the text is the same, the buffer may change on the UI thread during this
// method. If it does, we may give an incorrect response, but the diagnostics
// engine will know that the document changed and not display the lightbulb anyway.
if (Buffer.AsTextContainer().CurrentText == text &&
CanInvokeRename(out var trackingSession, waitForResult: true, cancellationToken: cancellationToken))
{
var snapshotSpan = trackingSession.TrackingSpan.GetSpan(Buffer.CurrentSnapshot);
// user needs to be on the same line as the diagnostic location.
if (text.AreOnSameLine(userSpan.Start, snapshotSpan.Start))
{
var title = string.Format(
EditorFeaturesResources.Rename_0_to_1,
trackingSession.OriginalName,
snapshotSpan.GetText());
return(new RenameTrackingCodeAction(ThreadingContext, document, title, refactorNotifyServices, undoHistoryRegistry, GlobalOptions),
snapshotSpan.Span.ToTextSpan());
}
}
return(default);
private static SyntaxNode?TryGetDeclaration(
UseExpressionBodyHelper helper,
SourceText text,
SyntaxNode node,
int position
)
{
var declaration = GetDeclaration(node, helper);
if (declaration == null)
{
return(null);
}
if (position < declaration.SpanStart)
{
// The user is allowed to be before the starting point of this node, as long as
// they're only between the start of the node and the start of the same line the
// node starts on. This prevents unnecessarily showing this feature in areas like
// the comment of a method.
if (!text.AreOnSameLine(position, declaration.SpanStart))
{
return(null);
}
}
return(declaration);
}
protected override IfStatementSyntax UpdateIf(
SourceText sourceText,
IfStatementSyntax ifNode,
SyntaxNode condition,
StatementSyntax trueStatement,
StatementSyntax falseStatementOpt = null
)
{
var isSingleLine = sourceText.AreOnSameLine(
ifNode.GetFirstToken(),
ifNode.GetLastToken()
);
if (isSingleLine && falseStatementOpt != null)
{
// If statement is on a single line, and we're swapping the true/false parts.
// In that case, try to swap the trailing trivia between the true/false parts.
// That way the trailing comments/newlines at the end of hte 'if' stay there,
// and the spaces after the true-part stay where they are.
(trueStatement, falseStatementOpt) = (
trueStatement.WithTrailingTrivia(falseStatementOpt.GetTrailingTrivia()),
falseStatementOpt.WithTrailingTrivia(trueStatement.GetTrailingTrivia())
);
}
var updatedIf = ifNode
.WithCondition((ExpressionSyntax)condition)
.WithStatement(
trueStatement is IfStatementSyntax
? SyntaxFactory.Block(trueStatement)
: trueStatement
);
if (falseStatementOpt != null)
{
var elseClause =
updatedIf.Else != null
? updatedIf.Else.WithStatement(falseStatementOpt)
: SyntaxFactory.ElseClause(falseStatementOpt);
updatedIf = updatedIf.WithElse(elseClause);
}
// If this is multiline, format things after we swap around the if/else. Because
// of all the different types of rewriting, we may need indentation fixed up and
// whatnot. Don't do this with single-line because we want to ensure as closely
// as possible that we've kept things on that single line.
return(isSingleLine
? updatedIf
: updatedIf.WithAdditionalAnnotations(Formatter.Annotation));
}
/// <summary>
/// Returns all of the trivia to the left of this token up to the previous token (concatenates
/// the previous token's trailing trivia and this token's leading trivia).
/// </summary>
public static IEnumerable <SyntaxTrivia> GetAllPrecedingTriviaToPreviousToken(
this SyntaxToken token, SourceText sourceText = null,
bool includePreviousTokenTrailingTriviaOnlyIfOnSameLine = false)
{
var prevToken = token.GetPreviousToken(includeSkipped: true);
if (prevToken.Kind() == SyntaxKind.None)
{
return(token.LeadingTrivia);
}
if (includePreviousTokenTrailingTriviaOnlyIfOnSameLine &&
!sourceText.AreOnSameLine(prevToken, token))
{
return(token.LeadingTrivia);
}
return(prevToken.TrailingTrivia.Concat(token.LeadingTrivia));
}
